Electron microscope



FIG. 1 is a front, top and right side perspective view of an electron microscope showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a right side elevational view thereof.

The broken lines shown are for illustrative purpose and form no part of the claimed design. 

We claim the ornamental design for an electron microscope, as shown and described. 